which subwofer is better?

They're both better. The JL line is generally a bit tighter and a bit more defined than the old DD Velodyne.

I had a 113 on loan for a few weeks and I owned the DD18. My main speakers are Avalon Acoustics Eidolons. Using their internal EQ I never got the JL to blend with my room and speakers. Its speed and definition always drew attention. Using the Velodyne EQ on the JL helped but it just wasn't a match. Even so the JL is a beautiful well made sub.

I've since moved on to a pair of Velodyne DD-12plus which have been substantially redesigned over the original DD series.

"BTW, the Velo DRC is IME rather primitive and MUST be set up manually.
Marty"

Primitive, really? Don't you find it odd that professional reviewers use the Velodyne software to show the effects of JL Audio's auto EQ system and even use the Velodyne software to further EQ the JL and many other brands of subwoofers being reviewed? I've done this myself.

Velodyne DD Plus has three methods of one touch optimization: Self-EQ, Auto-EQ, and Manual-EQ Optimization. There is a major degree of auto optimization within the Manual-EQ program by simply accepting the adjustment. The Manual-EQ also offers actual manual adjustments with eight bands of parametric adjustment between 15 and 100 Hz as well as parametric filtering.

There are also provisions for six different preset settings for things like Games and Theater, etc. But most importantly is the ability to make many of these adjustments remotely from the listening position as well as a simple volume with a numerical readout.

If there is another subwoofer that offers more sophistication and the ability to fine tune to integrate more seamlessly musical with a variety of main speakers please let us know.

Marty, after re-reading my response and realizing my misunderstanding of your point I'd like to apologize for my tone.

Vic